Millstone-dressing machines



2 Sheets-Sh eet 1.

D. S. GREENWALD. Millstone-Dressing Machine;

No. 224,085. v Patented Feb. 3, 1880.

. x WITI'QESSES KZKJINVENTGR' r lomm zwr fi q cflgh ATTORNEY;

N. PETERS. PHOTOMTMOGRAPMER, WASHINGTON. D. c.

2 Sheets-Sheet 2 D. s. GREENWALD. Millstone-Dressing Machine.

I IIIIIIIIIIIIIIIIHHII No. g24,0s5. Patented Feb 3, I880.

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7 NITED MSTATES DANIELS.IGREENWALD, or WARREN, onto.

MILL STONE-DRE S SING MACHINES.

SPECIFICATION formingpartof Letters Patent No. 224,085, dated February3, 1880.. Application filedJnne 3,1879. i i

To all whomit may concern: I

Be it known that I, DANIEL S. GREENWALD, of Warren, in the county ofTrumbull and State of Ohio, have invented certain new and usefulImprovements in Millstone-Dressing Machines; and I do hereby declarethefollowing to be afull, clear, and exact description of the invention,such as Will enable others skilled in the art to which it pertains tomake and use it, reference being had tothe accompanying drawings, whichform part of this specification. l y I t y My invention relatestoauimproved apparatus for dressing millstones and it consists, first,in afranie for supporting the dresser,

the said frame consisting of three or more radial arms hinged to acentral block, said arms adapted to rest upon the floor, and theirpoints of support maybe adjustable up or down for the purpose ofleveling the apparatus ;second,'

in combining with the said arms and their supports a circular chase orring, around which the dressing apparatus and its rear support maytravel; third, in a segmental sweep for y, supporting the rear end ofthe dressing appa- .ratus so that it may be adjusted to cut tangentiallyto any circle on the face of the stone fourth, insupporting-arms hingedat the cen- .ter, or between the center and the periphery,

in order that any one of them may be swung to one side to permit thedresser to operate in that localitywithout disturbing the other parts ofthe apparatus; also, in mechanism for levelin g the apparatus andforgiving to the tool any desired adjustment, so asto cut from the bottomof a throat out gradually to the surface of the land, and in other minorfeatures. In the drawings, Figure l is a plan view of an apparatusembodying my invention. Fig. 2 is a side elevation of the same. Fig.3 isa separate view of the dressing mechanism.

A suitable frame for supporting. the dresser.

is shown. This frame is composed ot'three or more arms, A, thoughpreferably four are employed, extendingradiall y from-the center-0f theI apparatus.

1 A is a central block,to which the arms are hinged at a. At the end ofthearms are uprights B, which are adj ustably connected with the arms,so as to admit of vertically adjustingthe said arms in order to suit theappathe upright and its corresponding arm A to be turned about the hingea without disturbing the other parts of the mechanism, thus permittingthe dressing-tool to be operated in the position occupied by theuprightwithout readjusting the machin t Dis a circular ring or flangesupported by the uprights, so as to be embraced by them and suspendedover the edge of the stone. This circular ring or flange serves as achase, upon which the outer end of the dresser is suspended and adjustedto any position upon the periphery.

E is a segmental support. Being the seg ment of a circle, it serves as asweep, along which the inner end of the dresser may be adjusted. Thissegmental frame, at itsextremities, rests against and slides upon thechasering 1),.aud at its center is pivoted to the lower end of theadjustable pivot F. This pivot F, I prefer to formic the nature of ascrew, so as ,to admit of a nice vertical ad justment. y t v J am-nutsf,or other equivalent devices, may be employed for setting the partssnugly when once in proper position.

The dresser consists of a frameor bed-plate, G, having its rear endsupported on the chase E by means of a set-screw and nut or othersuitable pivot, g. At its other end it is pivoted to a hinged block, G,which, in turn, is

hingedto the sliding head or guide block G,

as shown. The pivot g, at the outer end, is made adjustable up-and downin a suitable slot, 9?; p h 1 I t The pivot g is in the nature ot aset-screw, in order that when the apparatus is properly adjusted theparts may be set rigidly in their places. I

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The other parts of the dresser are of the usual form, H being the toolor diamond, adjustably connected with a sliding support, H, whichsupport slides between guides H as it is driven back and forth by thearm H At each travel of the tool a pawl, h, sets into the ratchet h onthe shaft 71/ which is screw-tapped through the tool-support, so as tofeed the tool laterally, in the usual manner.

The operation of this device is as follows: When it is desired to dressa millstone, the frame A is placed over the surface to be dressed, withits supports B resting upon the floor; the flanges at the bottom of theposts are placed in the grooves in the cleats C. Now all that remains tobe done is to level the apparatus and adjust it to the surface of thestone. To do this, if the stone is not already level, it should beleveled. The position of the cleats C has already centered the apparatusover the stone, though, if not accurately centered, this should be done.The arms A are then leveled by suitably adjusting their ends in theuprights B, and when suitably adjusted the chase-ring D will be level.The segmental sweep E may then be leveled by the central set-screw orpivot F. Being now suitably adjusted, the tool may be brought down inits proper position uponthe stone. Suppose, for instance, it is to dressa radial groove thethroat of which shall be deeper near the eye andshallow near the periphery of the stone. The proper radial inclinationmaybe given by means of the setscrew g and slot 9 whereby the outer endof the bed-plate Gr may be slightly elevated. If at the same time it isdesired to out the throat so that it shall be deep and abrupt at oneedge and gradually come out to the surface of the lands at the otheredge, an that is necessary to do is to loosen the set-screws g and 9,then rotate the bed-plate slightly around these set-screws as pivotsuntil the proper lateral inclination is given. The apparatus is thenready for work, and the tool may he acts uated either by hand, theoperator taking hold of the handle H or this handle may be suitablyconnected with machinery for reciprocating the tool back and forth.

When it is desired to dress a land, the bedplate should be set square asrespects its lateral adjustment and be given a radial inclinationcorresponding with the inclination of the surface of the stone.

It is frequently desirable to dress the stone deeper in the vicinity ofthe eye. To effect this it is only necessary to loosen the setscrew 9and adjust it sufficiently high to conform to the desired surface. Thisadjustment may, if desired, also be partially effected by lowering thecenter of the sweep E by running down the center pivot F.

If at any time the operation of the tool is impeded by one of theuprights B, this particular upright may be swung around its hinge tountil out of the way of the tool, and

this may be effected without disturbing the other parts of the machineryand without requiring readjustment of the parts, and in this respect mymachinery has decided advantages over other forms of apparatus fordressing millstones. Moreover, as my sweep E is connected with thechase-ring D, it is apparent that with one adjustment of the frame thedresser may be. caused to work upon every part of the stone, being freeto sweep through a complete circumference beneath the frame.

Another advantage of my apparatus is its portability, for it is apparentthat by swinging the arms together they may be packed into a compactform, the uprights may be readily removed, and when the arms are swungapart the chase-ring may be taken out and the seg--" mental sweep anddresser be all separated from the other parts. This is veryadvantageous, inasmuch as it enables theapparatus to be readily conveyedto any position within a mill and quickly put together over any stone.

Instead of using the cleats O, the apparatus may be provided withsharpened spuds O, which may set into the floor, and these spuds may bemade adjustable up or down soas not to interfere with the swinging asideof any arm when it is desired to do so.

The apparatus may be made of wood or metal, though for purposes ofportability I prefer that the frame-work shall be of wood, thechase-ring and sweep beingmade of metal.

The dresser-tool or diamond may be made single or in gangs, or thediamonds may be placed in the periphery of a suitable wheel, as shown,which wheel may be so adjusted by a suitable pin that but one diamondshall be brought into operation at a time, but admitting of quickadjustment by readjusting the pin so as to-brin g any other diamond intoplay. In mills where an apparatus of this character is employed thecleats 0 may be permanently attached to the floor, so that whenever itis desired to dress a millstone they will he already in proper positionto receive the frame.

It is apparent that the adjusting-screw F should be exactly central ofthe chase-rin g D. This may be effected in any suitable manner; but Ifind it convenient to supply upper and lower centering-p1ates,F, which,when the central opening is accurately adjusted, maybe fastened rigidlyin place.

I am aware that it is not new to combine in an apparatus for dressingmillstones a pivotal sweep with a chase -ring and a bed plate adapted tohave both radial and lateral inclithree or more radial arms supportedupon the floor by adjusting-supports B, the said arms adapted to beturned independently about the center, substantiallyas and for thepurposes described.

3. In an apparatus for dressing millstones,

a frame composed of three or more radial arms,

5. The dressing-tool consisting of a starformed Wheel provided Withdiamonds at its 20 points, said wheel being supported upon a pivot,about which it may be turned and set to bring any one of its diamondsinto use, substantially as and for the purposes described.

6. In combination with an adjusting-pivot, 2 5

F, the centering-plates F, substantially as and for the purposesdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

DANIEL S. GREENWALD.

Witnesses JNo. CROWELL, Jr., W. E. DONNELLY.

